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Full text of "Text Book Of Mechanical Engineering"

r

Moments of Inertia*

429

MOMENTS OP INERTIA OF AREA OR 2ND MOMENT (WITH AXIS

AS  SHEWN).

FOR BEAMS (rectangular.}

FOR SHAFTS (polar.'}

Section.



Rectangle

Square

Square

Hollow
Rectangle
or Square

Triangle

Circle

Hollow
Circle

Hexagon

Hexagon

i/t

ft



JL

12

_

64

16

bh

The same general formula
holds for shaft moment as
for beams,

thus Tm =/-

Note however the restrictions
at p. 420.

32

32

, ,,
_ -1- //» r

2

d

2

D

2